Joanne, have you thought of trying at the Seed Exchange forum? You will need some seeds to "exchange" with but that's easily rectified if you go to a dollar store or Walmart and pick up some cheap seed packets, divide them into tradeable lots and then post on the forum to get what you need.

Most garden centers should still have seed packets of things like Astilbe, Hosta, Columbines, Bleeding hearts, Corydallis etc... but you may find someone on Garden Web who is in your relative location who you can even swap live plants with.

Did you post on the Wintersowing forum too?

Just some thoughts...

Barb